Oil & Gas Geology ›› 2023, Vol. 44 ›› Issue (4): 962-975.doi: 10.11743/ogg20230413

• Petroleum Geology • Previous Articles     Next Articles

Characteristics of passive strike-slip structure and its control effect on fracture development in Bozi-Dabei area, Tarim Basin

Honghui GUO1(), Jianwei FENG1(), Libin ZHAO2,3   

  1. 1.School of Geoscience,China University of Petroleum (East China),Qingdao,Shandong 266580,China
    2.Tarim Oilfield,PetroChina,Korla,Xinjiang 841000,China
    3.Collgeg of Geoscience,China University of Petroleum (Beijing),Beijing 102249,China
  • Received:2023-01-16 Revised:2023-06-23 Online:2023-08-01 Published:2023-08-09
  • Contact: Jianwei FENG E-mail:guohonghui_0326@126.com;linqu_fengjw@126.com

Abstract:

The Kuqa Depression is of complex structural pattern under multi-stage orogeny, basal pre-existing structure and salt structure in the Meso-Cenozoic South Tianshan Mountains. It is of great significance to clarifying the control effect of such complex structural systems on fracture development. Based on the research results of predecessors, combined with the latest seismic data, outcrop survey, imaging data and core data, we systematically summarize and analyze the structural pattern and fracture distribution characteristics of the Bozi-Dabei area. The results show that since the Cenozoic, under the joint control of the orogeny of the Tianshan Mountains and the rotation of the Tarim plate, the structural system has passively slipped after thrusting. Under the control of multiple NEE-trending thrust faults, the structural system in the study area shows significant differences from south to north, showing obvious zonation; and under the control of the strike-slip adjustment structure, the strike-slip and thrust structures occur alternatively from east to west, showing obvious structural segmentation. Passive fault strike-slipping serves as the main factor controlling effective fracture development, resulting in zonation of fracture development under the control of strike-slip fault disturbance stress field. The fault-fracture system formed by the action of fault strike-slipping is key to increasing well productivity. This study discusses the fracture development pattern and well productivity characteristics under the control of passive strike-slip structure in the Bozi-Dabei area, which is of a basis to further research on the fracture development mechanism and of certain referential significance to the exploration and development of similar oil and gas fields.

Key words: passive strike-slipping, effective fracture, fault disturbance stress field, fracture distribution, structural model, Kuqa Depression, Tarim Basin

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